EP1144124B1 - Procede et appareil d'enduction d'articles avec un revetement liquide - Google Patents

Procede et appareil d'enduction d'articles avec un revetement liquide Download PDF

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Publication number
EP1144124B1
EP1144124B1 EP00935883A EP00935883A EP1144124B1 EP 1144124 B1 EP1144124 B1 EP 1144124B1 EP 00935883 A EP00935883 A EP 00935883A EP 00935883 A EP00935883 A EP 00935883A EP 1144124 B1 EP1144124 B1 EP 1144124B1
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EP
European Patent Office
Prior art keywords
coating
article
wave
liquid
excess
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP00935883A
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German (de)
English (en)
Other versions
EP1144124A2 (fr
EP1144124A3 (fr
Inventor
Peter D. c/o Robert G. McMorrow FOSTER Jr.
John Allie Charny
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Chinet Co Technology
Chinet Co
Original Assignee
Chinet Co Technology
Chinet Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Chinet Co Technology, Chinet Co filed Critical Chinet Co Technology
Publication of EP1144124A2 publication Critical patent/EP1144124A2/fr
Publication of EP1144124A3 publication Critical patent/EP1144124A3/fr
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Publication of EP1144124B1 publication Critical patent/EP1144124B1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
    • B05C5/0208—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work for applying liquid or other fluent material to separate articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/02—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape
    • B05B1/04—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape in flat form, e.g. fan-like, sheet-like
    • B05B1/044—Slits, i.e. narrow openings defined by two straight and parallel lips; Elongated outlets for producing very wide discharges, e.g. fluid curtains
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C13/00—Means for manipulating or holding work, e.g. for separate articles
    • B05C13/02—Means for manipulating or holding work, e.g. for separate articles for particular articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C3/00—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material
    • B05C3/18—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material only one side of the work coming into contact with the liquid or other fluent material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/18—Processes for applying liquids or other fluent materials performed by dipping
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/66—Treating discontinuous paper, e.g. sheets, blanks, rolls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/02—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface
    • B05C11/06—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface with a blast of gas or vapour
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S118/00—Coating apparatus
    • Y10S118/03—Container-related coater

Definitions

  • the invention relates to a process, and to apparatus, for applying a liquid coating to at least one surface of an article.
  • the process produces a high quality, attractive and uniform coating on both flat and contoured surfaces, while minimizing waste of the liquid coating.
  • the articles to be coated using the process are articles made of molded pulp.
  • Some manufactured articles can be improved by application of a coating on at least one surface of the article.
  • molded pulp articles used for serving food such as molded pulp plates and bowls
  • these articles can lose their form and/or function in the presence of heat, moisture and/or grease (for example, as in the case of a paper plate weakening when hot, wet food is held in the plate).
  • a protective barrier on a molded pulp or paper article can prevent loss of strength or rigidity due to such factors, which improves the performance of the article in immediate use, and in applications where food is held with or without refrigeration in the article for a period of time, and possibly heated, prior to consumption.
  • an article may provide additional surface strength, improving cut resistance, or adding to the aesthetic appearance of the article. For example, one may add color, patterns, textures and sheen to the surface of the article. One may also coat an article to protect an underlying print or to improve its printability.
  • GB 1,111,525 (published May 1,1968 ) describes some disadvantages of prior art efforts to coat articles, particularly articles with deep contours. For example, dipping an entire article in liquid coating can saturate the article and apply too much coating to the article. Furthermore, it is impractical to dip only the inside (food-contacting) surface of a deeply contoured article into a liquid coating material.
  • US-A-5,545,440 describes a method and apparatus to polymer coating of substrates using a stationary wave.
  • the method and apparatus disclosed in this prior art also has the problem that it provides an uneven coating and that no efficient use is made of the coating material.
  • the present invention relates to processes, and apparatus, for applying liquid coatings to a surface (or to more than one surface or edge) of an article.
  • the process comprises passing the surface of an article to be coated above an upwardly-directed wave of liquid coating to apply the coating to the surface in excess.
  • the wave of coating is applied by one or more upwardly pointed nozzles, which nozzles direct the wave (s) of coating onto the articles to be coated as the articles are passed above the nozzles and through the wave of coating.
  • the articles may be positioned on a moving conveyer belt which passes the articles through the wave coating (s), exposing the surface of the articles to be coated to an excess of the coating. After coating the surface of the article, the excess coating is then removed and the coated article is dried.
  • the wave coating of the article and the removal of excess coating, as described above, are carried out in an atmosphere which is vaporous with the liquid coating vehicle. This is accomplished by carrying out the coating application and coating removal steps in a closed environment.
  • the water which is the vehicle of the liquid coating is caused to permeate the coating atmosphere, to make the closed environment vaporous with the vapor of the coating vehicle.
  • the coatings are aqueous dispersions, and using these coatings, the closed atmosphere is vaporous with water vapor.
  • the excess coating is recovered and reused in the coating process.
  • a vaporous, closed environment as described it is possible to apply the coating, remove the excess coating, and reuse the coating, without substantial drying of the coating. This allows for significantly more efficient use and reuse of the liquid coating.
  • the apparatus of the invention comprises means for applying a wave of liquid coating to a surface of an article, means for removing the excess of liquid coating from the coated surface, means for recovering excess coating for reuse, and means for maintaining a closed environment, which is vaporous with the coating vehicle, during the coating application, coating removal and coating recovery.
  • the present invention provides a method for applying a liquid coating to at least one surface of a molded pulp article to achieve a uniform, high quality coating. While essentially any size or shape of article may be coated using this process, the present invention finds particular applicability to coating molded pulp articles for packaging and/or serving food, such as trays, plates, dishes and bowls.
  • molded pulp paper plates, and the coating of a single food-contacting surface of the paper plates will be described as exemplary in the discussion which follows. It will be understood that more than one surface of an article can be coated using this process, for example by repeated passes through the system.
  • the process of the invention using wave application of coating allows for minimizing the amount of liquid coating which is used to form the coating, without detracting from the quality of the coating.
  • the surfaces are coated at a fast and efficient rate, and are provided with a uniform coating on uneven or contoured surfaces of the article. Any of a variety of shapes can be coated.
  • inverted paper plates are passed into contact with at least one wave of liquid coating which is applied from below the articles.
  • the speed of the passing articles, and the flow volume of the wave of liquid coating are adjusted such that a great excess of coating (relative to a base amount of coating sufficient to contact the entire surface area of the article with coating) comes into contact with the article surface.
  • the entire surface is completely drenched with the liquid coating, including any areas of irregular shape or contour on the surface (such as the ridges between compartments in multi-compartment food trays and paper plates).
  • the application of excess coating ensures a complete and thorough coating over the entire surface. Since coating is collected and reused, the application of excess coating at this stage is not wasteful or inefficient.
  • the excess of liquid coating is applied in the form of a "wave".
  • a wave of liquid coating can be created by applying the coating through a nozzle, with the nozzle directed at an angle relative to the horizontal. The size, shape and angle of the wave can be adjusted to assure sufficient contact between the plate surface and an excess of the liquid coating.
  • a wave is essentially an upwardly-directed sheet of liquid.
  • More than one wave of liquid coating can be directed toward the same surface by different nozzles, in series or simultaneously.
  • one or more of the nozzles may be placed at an angle up to 90 degrees with respect to the horizontal (the horizontal being defined by the moving conveyer in this embodiment).
  • the wave(s) of coating are applied by coating application means positioned below the surface to be coated.
  • Coating application means may consist of nozzles situated below the moving paper plates.
  • a wave may be generated by forcing the liquid coating through a slotted orifice.
  • the nozzle opening (slot) is about 0,03 to 0.125 inches (0.76 to 3.18 mm), and the slot should be sufficiently long to provide a wave of coating at least as wide as the plates being coated.
  • the angle of the nozzle (s) relative to the passing plates can depend on the rate at which the articles pass through the coating area.
  • the angle of the nozzle can also depend on the surface structure and contour of the surface to be coated. For most uses including coating of compartmented molded pulp paper plates, a nozzle angle of about 45 degrees is appropriate. Using only minimal adjustments, the proper belt speed and nozzle angles needed to apply an excess of liquid coating can be determined.
  • the excess coating material is removed from the surface of the article.
  • the excess liquid coating is removed with high velocity air delivered from slotted air knives. The forced air from the air knives acts to thin and spread the coating over the surface, and to remove the excess coating material.
  • Means are provided to recover the excess liquid coating removed from the surface.
  • the material removed from the surfaces by the air knives can be collected below the moving plates and delivered to the coating area, for example in collection trays.
  • the recycled coating material can be filtered, screened, or stored before being returned to the coating area for reuse. Additional reconditioning of the liquid coating may be carried out before reuse (e. g., replenishing solid or vehicle, adding defoaming agent, further filtering, de-aeration, pH adjustment, temperature adjustment, and the like).
  • the vaporous environment allows the liquid coating to be fully and evenly spread on the surface of the article, and also aids in recovery and reuse of excess coating solution. It has been found that, if the coating dries to any significant extent before or during the coating removal step, undesired ripples and streaks can occur in the coating.
  • the liquid coatings are aqueous coatings, such as latexes.
  • aqueous coatings such as latexes.
  • the vaporous environment is humid with water vapor.
  • the level of water vapor in the atmosphere can be easily controlled, for example, by injecting water vapor into the closed environment or by entraining atomized liquid water in the air fed to the closed environment.
  • the air streams delivered through the air knives can be humid, which contributes to maintenance of a vaporous atmosphere inside the closed environment.
  • Fresh air entering the closed environment can be pre-humidified.
  • the humidified air delivered through the air knives forces excess liquid coating from the surface of the plate and spreads the remainder of the coating without drying the surface of the coating.
  • drying of the coated article is subsequently accomplished in a separate step, outside the vaporous atmosphere, by any conventional means such as heating in warm air. Additional means of drying include exposure to infrared, microwave or radio frequency radiation.
  • coatings examples include latexes, dispersions of polymers of ethylene, propylene, butadiene, styrene, vinyl acetate, vinyl chloride, vinylidene chloride, vinyl alcohol, amides, acrylic, polyester, epoxies, epoxy esters, hydrocarbon resins and mixtures or copolymers thereof.
  • the coating most preferred for coating molded pulp paper plates comprises a styrene-acrylic, styrene- butadiene or ethylenevinyl acetate aqueous dispersion.
  • Optional components of the coating include wax, mineral filler or colorants such as clay, titanium dioxide, calcium carbonate, silica, and organic or inorganic acids or bases.
  • the coating material is a water dispersion or emulsion containing about 15-65% total solids.
  • the viscosity of the coating should not be so high as to interfere with the application of the liquid in waves, for example generated through slotted nozzles, as described above.
  • Coatings of this type are available commercially, for example from Michelman, Inc., Cincinnati, Ohio and include Michelman "StainBan”Coatings.
  • the currently most preferred coating for paper plates is an aqueous dispersion of styrene-acrylic polymer, which contains about 30% total solids and contains a pigment (Ti02), an oil repellent, and optionally other processing aids.
  • some coated food containers can be used in conventional or microwave ovens to heat the contents.
  • Liquid coating materials are available which form coatings which can survive a range of temperature from deep freeze temperatures to temperature at which food is heated in a conventional oven, such as-20 to 425°F (-28.9 to 218.3°C).
  • Coatings are available which can be used on food containers which are"dual ovenable", that is, the containers are ovenable in either a conventional oven or in a microwave oven,
  • An example of a liquid coating suitable for making an ovenable coating is a mixture of water, sulfonated polyester (e.
  • Aqueous, acrylic-based materials suitable for making coatings for dual ovenable containers have been sold for many years by B. F. Goodrich under the name"Hycar".
  • Coating with an aqueous coating, a paper or pulp article such as a paper plate is sized with a conventional sizing agent to prevent or reduce water permeation into the article during the coating process.
  • Figure 1 shows a coating apparatus 10 as used for coating paper plates with liquid coating.
  • the apparatus generally comprises an inlet area 11, where the paper plates 13 are fed into the process, a main chamber defining the closed environment 20 wherein excess liquid coating is applied and removed, and an outlet station 40, where the plates are delivered from the closed environment for further processing (e. g. drying).
  • Paper plates 13 are loaded at the inlet area 11, either manually or automatically, in an upside-down orientation, and delivered for engagement with conveyer belt 21 which carries the paper plates into the closed environment 20 for coating and coating removal.
  • the conveyor belt 21 can be a pocketed conveyor having a plurality of openings which accommodate the depressed back of the paper plate, while the rim of the plate engages the conveyer belt. See Figure 2.
  • First subchambers 22 inside the closed environment 20 provide a suction force which holds the plates in the conveyer belt.
  • the rim of the plate forms a seal with the conveyer belt, and a tight seal between the plate rim and the conveyer belt keeps coating solution from entering the subchambers as the paper plate is coated.
  • the conveyer belt is made of foamed material or comprises a foam-like layer in contact with the plate.
  • the plates are picked up by the conveyer belt, and carried into the closed environment 20, with the surface to be coated facing downwardly.
  • the first subchambers 22 are shown as a number of separate chambers, and the vacuum pressure in each first subchamber 22 can be independent of that of the other first subchambers 22.
  • Separate vacuum force can be provided to each subchamber by vacuum connection 22d provided on each first subchamber.
  • each first subchamber 22 contains a number of secondary subchambers 22a, defined at the top by a top plate 22b and a bottom plate 22c.
  • the top plate above each secondary subchamber is provided with an orifice hole, to allow the vacuum from the first subchamber to draw into the second subchamber.
  • Each bottom plate 22c is provided with a plurality of smaller (e. g. one quarter inch diameter) holes, to allow the vacuum in the second subchambers to draw the plate 13 against the lowermost face of the bottom plate.
  • the plate 13 can contact the bottom plate 22c during operation, it has been found to be advantageous to compose the bottom plate of very high molecular weight polyethylene, which has a slipperiness which allows the plates 13 to glide easily over the bottom plate while they are being drawn against it by vacuum.
  • the closed environment 20 provides an atmosphere which is vaporous with the vehicle of the liquid coating. As shown at 24 there is a reservoir of liquid coating in the closed environment.
  • the paper plates are passed sequentially into a coating area, which is shown in Figure 1 with two oppositely-directed nozzles 23.
  • Each of the nozzles directs a wave of liquid coating onto the surface of the paper plates to provide a great excess of liquid coating on the surface.
  • the coating having been applied in excess, freely drips from the plate surface, which has been thoroughly drenched over its entire surface area with the liquid coating.
  • Figure 2 shows an enlarged view of the liquid coating being applied as a wave (only one nozzle being shown) to the food- contacting surface of a paper plate.
  • the paper plate is carried upside-down on the conveyer belt through the coating wave to apply the coating to the food contacting surface.
  • the liquid coating, delivered from the nozzles can be generously applied to the entire food- contacting surface of the plate, including the rim and the outermost edge of the rim. Excess liquid coating can drip back into the reservoir 24 from the surface.
  • the conveyer After coating, the conveyer carries the plates into the coating removal zone of the closed environment.
  • a series of air knives are shown at 25, which direct a flow of air sufficient to evenly spread the applied liquid coating and remove excess coating, which is collected below the air knives, and optionally stored in elevated reservoir 14 prior to reuse.
  • the conveyer can be cleaned off by secondary air knives 25 a, which also takes place inside closed environment 20.
  • a divider 26 can keep the reservoir of coating below the nozzles separate from the collection of coating below the air knives.
  • the number of air knives needed to remove the coating is not critical, and can depend on processing speed, type of coating, and other factors within the skill of the ordinary artisan.
  • the conveyer After removal of the coating by the air knives, the conveyer passes the plates out of the closed environment and into the outlet station 40.
  • a preferred outlet system is described in connection with Figure 1. As shown, the plates are transferred from the conveyer belt 21 to second conveyer belt 41, in the same upside-down orientation.
  • Shown at 42 is an air plenum, which directs air outwardly against the plates and holds them firmly against the second conveyer 41 at a distance from the air plenum. Thus, nothing but air contacts the freshly- coated surface when the plates exit the closed environment. The air flow from the plenum also starts to dry the coating on the surface of the plates.
  • the plates are carried by the second conveyer 41 in a direction around and below the air plenum, as shown. At the end of the second conveyer, the plates (now upright in orientation, with the coated surface facing upwardly) are deposited onto removal conveyer 43 to be carried to a drying station (not shown).
  • Figure 3 shows a preferred form of nozzle structure 50.
  • the structure includes a coating material inlet 51.
  • Inlet 51 supplies holding chamber 52, wherein the coating pressure builds as liquid coating fills the chamber.
  • Chamber outlets 53 release pressurized liquid coating from holding chamber 51 into wave chamber 54.
  • Wave chamber 54 holds the liquid coating under pressure, and the pressure forces the coating out of the nozzle through long, thin slot 55 to create the wave of liquid coating.
  • the size of the wave can be controlled by adjustment of the pressure inside the nozzle or by adjusting the height of elevated reservoir 14 which can supply the coating to the nozzles.
  • the amount of coating applied to the surface of the article normally depends on the intended use.
  • the process described herein provides a smooth uniform coat using a small amount of coating.
  • about 0.3 to 5 grams of coating (as solids) is applied to one full surface of an average sized (10 to 11" (25,4 to 27.9 cm) diameter) molded fiber plate.
  • 10.5" (26.7 cm) plates can be coated at a rate of about 5 plates per second.

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  • Application Of Or Painting With Fluid Materials (AREA)
  • Formation And Processing Of Food Products (AREA)

Claims (13)

  1. Procédé d'enduction d'une surface d'un article au moyen d'un revêtement liquide, comprenant un milieu de suspension, qui comprend le passage de la surface en contact avec au moins une onde de revêtement liquide afin d'appliquer un excédent de revêtement sur la surface, dans lequel la ou les ondes sont créées par des moyens d'application de revêtement positionnés au-dessous de la surface à enduire, caractérisé en ce que ledit milieu de suspension dudit revêtement est de l'eau, ledit article étant un article en pâte moulée qui est apprêté au moyen d'un agent de hydrofuge afin d'empêcher ou de réduire la perméation de l'eau dans ledit article au cours du procédé d'enduction, en ce que, après application dudit revêtement sur ledit article, le revêtement est étalé sur la surface dudit article et l'excédent de revêtement éliminé de celui-ci, ledit étalement et ladite élimination de l'excédent de revêtement étant effectués par de l'air forcé provenant de lames d'air qui agissent de manière à amincir et étaler le revêtement sur la surface et à éliminer l'excédent de substance d'enduction, dans un environnement fermé dans lequel une atmosphère de vapeur du milieu de suspension du revêtement est maintenue, l'atmosphère de vapeur étant maintenue de telle façon qu'il ne se produit pratiquement aucun séchage du revêtement liquide à la surface de l'article dans l'environnement fermé.
  2. Procédé selon la revendication 1, dans lequel le revêtement liquide est une dispersion ou une solution aqueuse de plastique, de résine ou de polymère.
  3. Procédé selon la revendication 2, dans lequel le revêtement liquide est une dispersion de styrène-butadiène.
  4. Procédé selon la revendication 1, dans lequel l'onde est créée par une buse positionnée au-dessous de l'article à enduire.
  5. Procédé selon la revendication 4, dans lequel le revêtement est appliqué sur la surface au moyen de plus d'une seule onde, les ondes étant appliquées sur la surface à partir de directions différentes.
  6. Procédé selon la revendication 1, dans lequel les lames d'air fournissent un air de vapeur du milieu de suspension du revêtement.
  7. Procédé selon la revendication 1, dans lequel l'article est une assiette, un plateau ou un bol en pâte à papier moulée.
  8. Procédé selon la revendication 1, comprenant en outre le séchage de l'article.
  9. Procédé selon la revendication 1, dans lequel le revêtement liquide est recyclé.
  10. Procédé selon la revendication 1, dans lequel les articles sont des assiettes en pâte à papier moulée et sont enduits à une cadence d'environ 5 assiettes/seconde.
  11. Appareil d'enduction d'au moins une surface d'un article comprenant :
    a) des moyens d'application de revêtement destinés à créer une onde de substance d'enduction liquide, lesquels moyens d'application de revêtement sont positionnés au-dessous de la surface à enduire ;
    b) des moyens de transport servant à déplacer l'article à travers l'onde d'enduction de sorte qu'un excédent de revêtement liquide soit appliqué sur la surface,
    caractérisé en ce que
    ledit appareil est agencé de façon à enduire des articles en pâte à papier moulée ; et comprend
    c) des moyens d'apprêtage de l'article en pâte à papier moulée à enduire ;
    d) des lames d'air destinées à l'étalement du revêtement sur la surface et à l'élimination de l'excédent de revêtement de la surface,
    e) des moyens destinés à fournir un environnement fermé dans lequel les lames d'air servant à étaler le revêtement sur la surface et à éliminer l'excédent de revêtement de la surface sont fournis.
  12. Appareil selon la revendication 11, dans lequel les moyens servant à créer une onde comprennent au moins une buse à fente.
  13. Appareil selon la revendication 12, dans lequel les moyens servant à déplacer l'article à travers l'onde de revêtement comprennent une courroie transporteuse mobile présentant des ouvertures pour maintenir les articles à enduire.
EP00935883A 1999-06-30 2000-05-09 Procede et appareil d'enduction d'articles avec un revetement liquide Expired - Lifetime EP1144124B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US09/343,618 US6245388B1 (en) 1999-06-30 1999-06-30 Wave coating of articles
US343618 1999-06-30
PCT/US2000/012585 WO2001002103A2 (fr) 1999-06-30 2000-05-09 Procede et appareil d'enduction d'articles avec un revetement liquide

Publications (3)

Publication Number Publication Date
EP1144124A2 EP1144124A2 (fr) 2001-10-17
EP1144124A3 EP1144124A3 (fr) 2002-09-11
EP1144124B1 true EP1144124B1 (fr) 2008-01-23

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EP00935883A Expired - Lifetime EP1144124B1 (fr) 1999-06-30 2000-05-09 Procede et appareil d'enduction d'articles avec un revetement liquide

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US (1) US6245388B1 (fr)
EP (1) EP1144124B1 (fr)
AT (1) ATE384586T1 (fr)
AU (1) AU5127900A (fr)
DE (1) DE60037875T2 (fr)
WO (1) WO2001002103A2 (fr)

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SE527570C2 (sv) * 2004-10-05 2006-04-11 Vaelinge Innovation Ab Anordning och metod för ytbehandling av skivformat ämne samt golvskiva
US8215078B2 (en) 2005-02-15 2012-07-10 Välinge Innovation Belgium BVBA Building panel with compressed edges and method of making same
US7578871B2 (en) * 2005-05-25 2009-08-25 Generon Igs, Inc. Gas separation membrane with partial surfactant coating
US20070175144A1 (en) 2006-01-11 2007-08-02 Valinge Innovation Ab V-groove
US8323016B2 (en) 2006-09-15 2012-12-04 Valinge Innovation Belgium Bvba Device and method for compressing an edge of a building panel and a building panel with compressed edges
DE102007013637B4 (de) * 2007-03-19 2018-12-20 Ewald Dörken Ag Verfahren zum Beschichten von metallischen Werkstücken
BR112012012738A2 (pt) * 2009-11-27 2016-08-30 Pakit Int Trading Co Inc metodo para aplicar um material de barreira em um produto fibroso moldado e um produto produzido pelo dito metodo
RU2540743C2 (ru) 2009-12-17 2015-02-10 Велинге Инновейшн Аб Способы и устройства, связанные с формированием поверхностей строительных панелей
CN110918378A (zh) * 2018-09-19 2020-03-27 漳浦比速光电科技有限公司 一种用于led产品制作的点胶装置及其点胶方法
KR102400787B1 (ko) * 2020-05-28 2022-05-23 (주)거상 전자기기 케이스의 코팅장치
KR102400788B1 (ko) * 2020-09-01 2022-05-23 (주)거상 전자기기 케이스의 코팅장치
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Also Published As

Publication number Publication date
DE60037875T2 (de) 2008-04-30
DE60037875D1 (de) 2008-03-13
WO2001002103A3 (fr) 2001-08-02
EP1144124A2 (fr) 2001-10-17
ATE384586T1 (de) 2008-02-15
EP1144124A3 (fr) 2002-09-11
US6245388B1 (en) 2001-06-12
WO2001002103A2 (fr) 2001-01-11
AU5127900A (en) 2001-01-22

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